Grounding Concept For The S7-300 With Cpu 31Xc - Siemens SIMATIC S7-300 Hardware And Installation Manual

L1
L2
L3
N
PE
Rail
AC
AC
AC
* In the case of CPU 31xC or 312 IFM, the connection will automatically be established
Figure 5-13 Grounding concept for the S7-300 with CPU 31xC
All CPUs except CPU 31xC
The figure below shows you the complete assembly of an S7-300 with TN-S mains
supply (does not apply to CPU 31xC).
Apart from powering the CPU, the PS 307 also supplies the load current for the 24
VDC modules.
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
low-voltage distribution
e. g. TN-S System (3 x 400 V)
PS
*
L1
N
AC
DC
DC
Cabinet
SM
CPU
µP
L +
M
Signal modules
Ground bus in cabinet
AC 24 to 230V l oad circuit
DC 5 to 60V l oad circuit for
non-isolated DC modules
DC 5 to 60V load circuit for isolated
DC modules
Configuring
for AC modules
5-29